| Summary: | Infinite client hang in xcb_wait_for_special_event() - xserver 1.20rcX | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | xorg | Reporter: | Tobias Klausmann <tobias.johannes.klausmann> | ||||||
| Component: | Driver/modesetting | Assignee: | Xorg Project Team <xorg-team> | ||||||
| Status: | RESOLVED DUPLICATE | QA Contact: | Xorg Project Team <xorg-team> | ||||||
| Severity: | normal | ||||||||
| Priority: | medium | CC: | answer2002, maggu2810 | ||||||
| Version: | git | ||||||||
| Hardware: | x86-64 (AMD64) | ||||||||
| OS: | Linux (All) | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
| Attachments: |
|
||||||||
Created attachment 139311 [details] [review] Disable new code Does this patch on top of current xserver Git master still prevent the problem? (In reply to Michel Dänzer from comment #1) > Created attachment 139311 [details] [review] [review] > Disable new code > > Does this patch on top of current xserver Git master still prevent the > problem? Yes the old code/interfaces does still work fine on top of latest master. This might actually be a duplicate of bug #106351 which i haven't checked :/. Yet we already made a bit of progress on this bugreport with bisecting and testing old & new code, leaving this one open for now seems reasonable... *** This bug has been marked as a duplicate of bug 106351 *** |
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.
Created attachment 139302 [details] gdb backtrace of hanging plasmashell thread Starting with bisected commit 44d5f2eb8a2f92571698adec39ac569b71da5a1b - "xf86-video-modesetting: Support new vblank kernel API [v2]" Clients seem to miss events, here plasmashell [1]. This is easily reproduced by opening and closing the menu until plasmashell hangs. It seems to me that the server/driver does not properly report all vblank events. Working around by calling xcb_poll_for_special_event() instead of xcb_wait_for_special_event() in the client call path "resolves" the issue in a dirty way on the client side. Just to collect a bit more info: HW: VGA compatible controller: Intel Corporation Device 591b (rev 04) tested kernel: 4.16.x & 4.17rc If you need more info, please let me know!